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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 883   $ 16,973    
Long- term 182,074 $ 9,339 177,022    
Total 182,957   193,995 $ 236,238 $ 229,343
Floating interest rate [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term 262   7,282    
Long- term 66,819   53,389    
Total $ 67,081   $ 60,671    
Short-term 7.80% 7.80% 6.10%    
Long-term 3.60% 3.60% 3.00%    
Fixed interest rate [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 621   $ 9,691    
Long- term 115,255   123,633    
Total $ 115,876   $ 133,324    
Short-term 4.20% 4.20% 4.80%    
Long-term 5.60% 5.60% 5.70%    
US Dollar [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 589   $ 6,206    
Long- term 114,696   107,508    
Total $ 115,285   $ 113,714    
Effective rate 5.80% 5.80% 5.90%    
Euro [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 12   $ 9,705    
Long- term 52,368   54,906    
Total $ 52,380   $ 64,611    
Effective rate 3.30% 3.30% 3.50%    
Pounds [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 0   $ 0    
Long- term 8,631   9,141    
Total $ 8,631   $ 9,141    
Effective rate 2.90% 2.90% 2.60%    
Philippine pesos [member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 52   $ 0    
Long- term 5,041   5,408    
Total $ 5,093   $ 5,408    
Effective rate 4.60% 4.60% 4.60%    
Other Currencies [Member]          
Disclosure of detailed information about financial instruments [line items]          
Short- term $ 230   $ 1,062    
Long- term 1,338   59    
Total $ 1,568   $ 1,121    
Effective rate 5.90% 5.90% 6.20%